Charge transfer in LaVO3/LaTiO3 multilayers: Strain-controlled dimensionality of interface metallicity between two Mott insulators

Authors: Sophie Beck1*, Claude Ederer1*

  1. Materials Theory, ETH Zürich, Wolfgang-Pauli-Strasse 27, 8093, Zürich, Switzerland
  • Corresponding authors emails: sophie.beck@mat.ethz.ch, claude.ederer@mat.ethz.ch

DOI10.24435/materialscloud:2019.0059/v1 (version v1, submitted on 17 October 2019)

How to cite this entry

Sophie Beck, Claude Ederer, Charge transfer in LaVO3/LaTiO3 multilayers: Strain-controlled dimensionality of interface metallicity between two Mott insulators, Materials Cloud Archive (2019), doi: 10.24435/materialscloud:2019.0059/v1.

Description

We use density-functional theory plus dynamical mean-field theory to demonstrate the emergence of a metallic layer at the interface between the two Mott insulators LaTiO3 and LaVO3. The metallic layer is due to charge transfer across the interface, which alters the valence state of the transition-metal cations close to the interface. Somewhat counterintuitively, the charge is transferred from the Ti cations with formal d1 electron configuration to the the V cations with formal d2 configuration, thereby increasing the occupation difference of the t2g states. This can be understood as a result of a gradual transition of the charge-transfer energy, or electronegativity, across the interface. The spatial extension of the metallic layer, in particular toward the LaTiO3 side, can be controlled by epitaxial strain, with tensile strain leading to a localization within a thickness of only two unit cells. Our results open up a route for creating a tunable quasi-two-dimensional electron gas in materials with strong electronic correlations.

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Keywords

Dynamical Mean Field Theory MARVEL/DD5 First-principles calculations Mott insulators Multilayer thin films Superlattices Two-dimensional electron gas

Version history

17 October 2019 [This version]